package com.atguigu.gulimall.auth.controller;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.alibaba.fastjson.TypeReference;
import com.atguigu.common.constant.AuthServerConstant;
import com.atguigu.common.exception.BizCodeEnume;
import com.atguigu.common.utils.R;
import com.atguigu.common.vo.MemberResponseVo;
import com.atguigu.gulimall.auth.feign.MemberFeignService;
import com.atguigu.gulimall.auth.feign.ThirdPartFeignService;
import com.atguigu.gulimall.auth.vo.UserLoginVo;
import com.atguigu.gulimall.auth.vo.UserRegistVo;
import org.apache.http.util.EntityUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.util.StringUtils;
import org.springframework.validation.BindingResult;
import org.springframework.validation.FieldError;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.servlet.mvc.support.RedirectAttributes;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import javax.validation.Valid;
import java.util.HashMap;
import java.util.Map;
import java.util.UUID;
import java.util.concurrent.TimeUnit;
import java.util.stream.Collectors;

/**
 * @title: LoginController
 * @Author syh
 * @Date: 2022/7/5 18:28
 * @Version 1.0
 */

@Controller
public class LoginController {

    @Autowired
    ThirdPartFeignService thirdPartFeignService;

    @Autowired
    StringRedisTemplate redisTemplate;

    @Autowired
    MemberFeignService memberFeignService;

    @ResponseBody
    @GetMapping("/sms/sendcode")
    public R sendCode(@RequestParam("phone") String phone) {
        // TODO 1.接口防刷
        String redisCode = redisTemplate.opsForValue().get(BizCodeEnume.SMS_CODE_EXCEPTION + phone);
        if (!StringUtils.isEmpty(redisCode)) {
            long redisTime = Long.parseLong(redisCode.split("_")[1]);
            if (System.currentTimeMillis() - redisTime < 60000) {
                // 当前手机号验证码在60秒内,不能再发
                return R.error(BizCodeEnume.SMS_CODE_EXCEPTION.getCode(), BizCodeEnume.SMS_CODE_EXCEPTION.getMsg());
            }
        }

        // 2.验证码校验  保存到redis中  key:phone   value:code
        String code = UUID.randomUUID().toString().substring(0, 5);

        thirdPartFeignService.sendCode(phone, code);

        code = code + "_" + System.currentTimeMillis();

        // redis中缓存验证码,防止同一个手机号在60秒内在此发送验证码
        redisTemplate.opsForValue().set(BizCodeEnume.SMS_CODE_EXCEPTION + phone, code, 10, TimeUnit.MINUTES);

        return R.ok();
    }

    /**
     * // TODO 重定向携带数据，利用session原理。将数据放在session中。
     * 只要跳到下一个页面取出这个数据以后，session里面的数据就会删掉
     * <p>
     * // TODO 1、分布式下的session问题。
     * RedirectAttributes redirectAttributes：模拟重定向携带数据
     *
     * @param vo
     * @param result
     * @param redirectAttributes
     * @return
     */
    @PostMapping("/regist")
    public String regist(@Valid UserRegistVo vo, BindingResult result,
                         RedirectAttributes redirectAttributes) {
        if (result.hasErrors()) {
            /**
             * .map(fieldError -> {
             *                 String field = fieldError.getField();
             *                 String message = fieldError.getDefaultMessage();
             *                 return errors.put(field,message);
             *             })
             */
            Map<String, String> errors = result.getFieldErrors().stream().collect(Collectors.toMap(FieldError::getField, FieldError::getDefaultMessage));

//            model.addAttribute("errors", errors);
            redirectAttributes.addFlashAttribute("errors", errors);
            // 如果校验中有错误,转发回注册页

            //Request method 'POST' not supported
            //用户注册->/regist[post]----》转发/reg.html（路径映射默认都是get方式访问的。）
            // 相当于是通过一个post请求给转发给get请求,所以报错
            return "redirect:http://auth.gulimall.com/reg.html";
        }


        // 真正注册,调用远程服务进行注册
        // 1.校验验证码
        String code = vo.getCode();
        // 从redis中获取保存的验证码信息
        String redisCode = redisTemplate.opsForValue().get(BizCodeEnume.SMS_CODE_EXCEPTION + vo.getPhone());
        if (!StringUtils.isEmpty(redisCode)) {
            String[] split = redisCode.split("_");
            if (code.equals(split[0])) {
                // 删除验证码:令牌机制
                redisTemplate.delete(BizCodeEnume.SMS_CODE_EXCEPTION + vo.getPhone());

                // 验证码通过
                R r = memberFeignService.regist(vo);
                if (r.getCode() == 0) {
                    // 成功
                    // 注册成功回到首页,回到登录页
                    return "redirect:http://auth.gulimall.com/login.html";
                } else {
                    Map<String, String> errors = new HashMap<>();
                    errors.put("msg", r.getData("msg", new TypeReference<String>() {
                    }));
                    redirectAttributes.addFlashAttribute("errors", errors);
                    return "redirect:http://auth.gulimall.com/reg.html";
                }

            } else {
                Map<String, String> errors = new HashMap<>();
                errors.put("code", "验证码错误");
                redirectAttributes.addFlashAttribute("errors", errors);
                return "redirect:http://auth.gulimall.com/reg.html";
            }
        } else {
            Map<String, String> errors = new HashMap<>();
            errors.put("code", "验证码错误");
            redirectAttributes.addFlashAttribute("errors", errors);
            //校验出错，转发到注册页
            // 注册失败,重定向回注册页面  /:表示以项目域名为准 因为已经配置了springmvc的视图映射
            return "redirect:http://auth.gulimall.com/reg.html";
        }
    }

    @PostMapping("/login")
    public String login(UserLoginVo vo, RedirectAttributes redirectAttributes,
                        HttpSession session) {

        // 远程登录
        R login = memberFeignService.login(vo);
        if (login.getCode() == 0) {
            // 成功
            MemberResponseVo data = login.getData("data", new TypeReference<MemberResponseVo>() {
            });
            // 登录成功将用户信息放到session中
            session.setAttribute(AuthServerConstant.LOGIN_USER, data);
            return "redirect:http://gulimall.com";
        } else {
            Map<String, String> errors = new HashMap<>();
            errors.put("msg", login.getData("msg", new TypeReference<String>() {
            }));
            redirectAttributes.addFlashAttribute("errors", errors);
            return "redirect:http://auth.gulimall.com/login.html";
        }
    }

    @GetMapping("/login.html")
    public String loginPage(HttpSession session) {
        Object attribute = session.getAttribute(AuthServerConstant.LOGIN_USER);
        if (attribute == null) {
            // 没登录  展示登录页
            return "login";
        } else {
            // 登录了直接跳转回首页
            return "redirect:http://gulimall.com";
        }
    }
}
